Key Facts and Data Points

  • Location: Visakhapatnam, Andhra Pradesh – selected for its robust technological ecosystem and easy access to sea water for cooling.
  • Project Agency: Raja Ramanna Centre for Advanced Technology (RRCAT), Department of Atomic Energy (DAE).
  • Technology: High‑energy proton accelerator → spallation neutron source → sub‑critical reactor (ADS).
  • India’s Thorium Reserves: ~25% of global thorium reserves.
  • Three‑Stage Nuclear Programme: 1) Pressurised Heavy Water Reactors (PHWR) using natural uranium, 2) Fast Breeder Reactors (FBR) using plutonium, 3) Thorium‑based reactors using U‑233 produced in ADS.

Background and Context

  • Accelerator‑Driven System (ADS): Utilises a proton beam (typically 1‑2 GeV) to strike a heavy‑metal target (lead/bismuth), causing spallation and releasing a high flux of neutrons. These neutrons sustain fission in a sub‑critical core that cannot run on its own, offering inherent safety.
  • Spallation Reaction: High‑energy protons break heavy nuclei, emitting 20‑30 neutrons per incident proton.
  • RRCAT’s Legacy: Developed India’s synchrotron sources (Indus‑1, Indus‑2), laser systems, and accelerator technologies; now extending to nuclear energy applications.

Significance for India / Governance / Policy

  • Thorium Utilisation: ADS provides the intense neutron flux needed to convert fertile Th‑232 to fissile U‑233, moving India towards a thorium‑dominant energy mix.
  • Nuclear Waste Management: High‑energy neutrons can transmute long‑lived minor actinides into shorter‑lived isotopes, reducing the radiotoxicity and storage burden.
  • Energy Security: Diversifies the nuclear fuel cycle, lessening dependence on imported uranium.
  • Strategic Autonomy: Indigenous accelerator technology aligns with the ‘Make in India’ vision for critical nuclear infrastructure.
  • Safety Enhancement: Sub‑critical operation ensures automatic shutdown if the accelerator fails, addressing public and regulatory concerns.

Related Constitutional / Legal Provisions

  • Atomic Energy Act, 1962 (amended 2005) – governs the development, production and use of atomic energy in India.
  • Nuclear Safety Rules, 2016 – prescribe safety standards for reactors, including provisions for sub‑critical systems.
  • National Policy on Thorium Utilisation (2019) – outlines the roadmap for thorium‑based nuclear power.

References for UPSC

  • Three‑Stage Programme – Homi Bhabha’s vision; crucial for GS Paper‑1 (Science & Tech) and GS Paper‑2 (Security & Policy).
  • Monazite & Thorium – Frequently asked in prelims (source of rare earths & thorium).
  • IAEA Safeguards – Differentiates reactors using imported uranium vs. domestic thorium/uranium.

Prepared for UPSC Civil Services Examination – Current Affairs & Science & Technology